serial connection freezes host

Hi there,

Since some time, the attempt to hotsync my PDA via serial connection
does result in a complete freeze of my notebook. I don't know exactly
since when this happens, because i usually don't hotsync that often,
but i'm sure it happens without changing anything on my system but the
frequent world and kernel updates.

The host is an IBM ThinkPad t40 running a some days old 6.0-CURRENT,
which provides serial connection to a Palm m505 handheld
running PalmOS version 4.0

Some informational snippets:

freddy_at_pegasus:~ 0% dmesg | grep sio0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 3 flags 0x10 on acpi0
sio0: type 16550A

freddy_at_pegasus:~ 0% pkg_version -v -s pilot-link
pilot-link-0.11.8_3                 =   up-to-date with port

After plugging the PDA, starting "pilot-xfer -p /dev/cuad0 -l" and
pressing the hotsync button, the notebook stands still - still as in
complete freeze. Only a power cycle can reanimate the notebook - but
nothing is found in any log providing an idea on what was going on.

Any information appreciated :-)

Regards,

Frank

-- 
"Two of the most famous products of Berkeley are LSD and Unix.
I don't think that this is a coincidence."
        -- Anonymous